56 lines
1.1 KiB
Markdown
56 lines
1.1 KiB
Markdown
---
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id: 5900f52a1000cf542c51003c
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challengeType: 5
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title: 'Problem 445: Retractions A'
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videoUrl: ''
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localeTitle: 问题445：撤回A.
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---
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## Description
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<section id="description">对于每个整数n> 1，函数族fn，a，b由fn，a，b（x）≡ax+ b mod n定义为a，b，x整数和0 <p>对于c = C（100 000，k），1≤k≤99999≡628701600（mod 1 000 000 007），给出ΣR（c）。 （C（n，k）是二项式系数）。 </p><p>找到ΣR（c）得c = C（10 000 000，k），1≤k≤9999 999.给出你的答案模1 000 000 007。 </p></section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>euler445()</code>应该返回659104042。
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testString: 'assert.strictEqual(euler445(), 659104042, "<code>euler445()</code> should return 659104042.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function euler445() {
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// Good luck!
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return true;
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}
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euler445();
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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